Line car equipped with a reciprocating powder stirring mechanism and bicycle-type line drawing device

Abstract

In hand-pushed line cars, powders such as lime stored inside the hopper solidify due to moisture, forming bridges that make discharge unstable and cause the line to become blurred or broken. Conventional agitating members that rotate integrally with the axle have difficulty in adequately crushing and agitating the solidified powder. [Solution] A motion conversion unit that converts rotational motion into reciprocating motion is provided on the axle that rotates in conjunction with the line car's wheels. A powder agitator with a wave-shaped beam at the top is connected to this motion conversion unit at its legs. When the axle rotates, the motion conversion unit converts the rotational motion into up-and-down reciprocating motion of the powder agitator. The crushing action caused by this up-and-down movement effectively crushes and agitates solidified powder, enabling stable powder discharge and drawing uniform, clear lines.

Description

[Technical Field]

[0001] The present invention relates to a hand-pushed line car used to draw lines on the ground using powder such as lime, slaked lime, calcium carbonate, or colored pigments in sports grounds, stadiums, parking lots, construction sites, etc. More specifically, the present invention relates to an improved powder agitation mechanism that prevents the powder stored inside from solidifying or clogging due to moisture or pressure caused by its own weight, and always discharges the powder stably and uniformly. The present invention can be applied not only to the field of sports equipment, but also to various technical fields that handle powder, such as the spreading of fertilizer and seeds in agriculture and the measured supply of powder materials in the construction industry. [Background technology]

[0002] Since ancient times, when outdoor athletic fields are used for physical education classes in schools, local sports competitions, etc., hand-operated line marking devices (hereinafter referred to as "line cars" in this specification) have been widely used to draw lines on the ground using powder such as lime. In these applications, accurate and clear lines are important for ensuring the fairness and safety of the competition.

[0003] The basic components of this type of line car include a hopper, which is a container for storing powder, a handle that allows the user to push and move the car, a pair of wheels that support the hopper and roll on the ground, an axle that rotates in conjunction with the wheels, and a powder discharge outlet formed at the bottom of the hopper that drops the powder onto the ground.

[0004] To ensure stable powder discharge, a stirring mechanism of some kind is typically provided inside the hopper. For example, as shown schematically in FIG. 9, some hoppers have a brush-like rotary stirring mechanism 200 inside that rotates integrally with the axle 300. When the line car moves and the wheels rotate, this rotary stirring mechanism 200 rotates, sending the powder to the discharge port and forming a line. However, the powder inside the hopper is prone to solidifying due to moisture, etc., and a phenomenon known as a "bridge" occurs, in which the powder clogs the top of the discharge port, causing the line to become faint or break, which is an issue.

[0005] In order to solve such problems, for example, Patent Document 1 discloses a line drawing device that has a rotary supply mechanism in which a hollow cylindrical rotating roller is placed above the discharge outlet and multiple blade members are arranged at intervals around the roller, with the aim of reducing the occurrence of shading, hollowing, and locking phenomena.

[0006] Furthermore, in order to make line drawing work over a wider area more efficient, the inventor of the present application has previously developed a bicycle-type line drawing device in which a push-button line car is attached to the front of a bicycle and lines are drawn while the bicycle is moving (see, for example, Patent Documents 2 to 5). These devices were revolutionary in that they significantly reduced the burden on the worker, but their powder discharge mechanisms were based on the same rotary stirring mechanism as conventional push-button line cars, and fundamental issues such as powder solidification and the formation of bridges still remained. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-96845 [Patent Document 2] Patent No. 6793276 [Patent Document 3] Patent No. 6892546 [Patent Document 4] Patent No. 6918266 [Patent Document 5] Patent No. 7677744 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in a conventional rotary stirring mechanism 200 as shown in Fig. 9, or in a configuration in which the stirring member simply rotates in one direction together with the axle 300 as described in Patent Documents 1 to 5 (hereinafter referred to as a "rotary stirring mechanism"), the stirring action is limited to rotational motion. This rotational motion has an essential problem in that the stirring member simply slips on solidified powder, and is not able to provide sufficient crushing force.

[0009] In other words, powders such as lime used in line cars often have small particle diameters and are hygroscopic (deliquescent). Therefore, in high-humidity environments, such as during the rainy season or after rainfall, they absorb moisture from the air, coagulate, and become very sticky. When using a rotary mixing mechanism for powders in this state, the mixing members tend to spin idly through the powder, making it difficult to effectively mix them.

[0010] Furthermore, as the powder is consumed, stress concentrates within the powder layer inside the hopper, increasing the force that presses the powder toward the hopper wall, forming a cavity only around the agitator, and the powder outside of this solidifies into an arch shape that does not collapse, a phenomenon known as a "bridge." Once a strong bridge is formed, the rotary agitator mechanism, which relies primarily on rotational motion, is unable to adequately break it down, resulting in the problem of powder discharge stopping.

[0011] Furthermore, in corners of the hopper that are not in the rotational orbit of the agitator, the powder remains unmixed and solidifies over time, causing discharge problems. These problems not only cause the lines to be broken or uneven in color, which ruins the appearance of the playing field, but also forces the line to be redrawn, increasing the burden on the workers.

[0012] The present invention was made in consideration of the problems inherent in the prior art, and its purpose is to provide a mechanism for stirring powder using a reciprocating motion that is completely different from the rotary motion of conventional rotary stirring mechanisms. This aims to provide an extremely reliable line car that can effectively and reliably crush and stir even powder that has solidified under high humidity and strong bridges, enabling stable line drawing under any conditions. [Means for solving the problem]

[0013] The line car according to the present invention comprises: a hopper for storing powder; a rotatable wheel and an axle that support the hopper and rotate together with the wheel; a powder discharge port provided on the bottom surface of the hopper; Equipped with a motion conversion unit provided on the axle for converting rotational motion of the axle into reciprocating motion in an up-and-down direction; a powder agitating member connected to the motion converting unit and configured to agitate the powder in the hopper by reciprocating motion in the up and down direction; Further equipped with 、 the motion converting unit includes at least two crank units, each of which is a rotating body having a center eccentric to the axis of the axle, spaced apart in the axial direction of the axle; The powder agitating member has at least two connecting portions, each of which is slidably fitted to the outer periphery of the corresponding crank portion, and moves up and down reciprocally as the crank portion rotates. It is characterized by the following. [Effects of the Invention]

[0014] According to the present invention, the power of the axle that rotates as the line car moves is converted into reciprocating motion, particularly up-and-down reciprocating motion, of the powder agitating member via the motion conversion section.

[0015] The up and down movement of this agitator applies a vertical impact force to the solidified powder, just like driving a stake into the ground. Furthermore, by curving the agitator forward, it also acts in the front and back directions of the hopper, evenly loosening the powder throughout the bottom. This effectively breaks down the strong bridges that were difficult to form with conventional rotary agitators, making it possible to keep the powder constantly fluid.

[0016] As a result, the device is highly independent of the type of powder (particle size, moisture content, etc.) and the external environment (temperature, humidity), and can consistently supply a consistent, uniform amount of powder from the outlet under any conditions. This offers the remarkable benefit of allowing users to consistently draw uniform, clear, high-quality lines without worrying about lines becoming faint or broken. Furthermore, it also reduces the burden on the operator by eliminating the need for extra work, such as shaking the device to clear powder clogging. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing the overall configuration of a line car according to an embodiment of the present invention; [Figure 2] 1 is a diagram showing a main part of a powder agitation mechanism according to an embodiment of the present invention. FIG. [Figure 3] 10A to 10C are diagrams illustrating the operation of a crank portion according to the embodiment of the present invention. [Figure 4] 10A and 10B are diagrams for explaining the bridge-breaking action of the stirring mechanism of the present invention. [Figure 5] FIG. 10 is a view showing a main part of a powder agitation mechanism according to another embodiment of the present invention. [Figure 6] FIG. 10 is a side view illustrating a swing mechanism according to another embodiment of the present invention. [Figure 7] 10A and 10B are diagrams showing a powder agitating member according to another embodiment of the present invention. [Figure 8] FIG. 10 is a side view showing a bicycle-type line marking device according to another embodiment of the present invention. [Figure 9] FIG. 1 is a schematic perspective view showing the internal structure of a conventional line car. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding components are designated by the same reference numerals, and redundant explanations will be omitted as appropriate.

[0019] (Overall configuration of the line car) 1 shows the overall configuration of a line car 1 according to this embodiment, with (a) being a front view and (b) being a side view. The line car 1 is mainly composed of a hopper 2, which is a container for storing powder P therein, a handle 4 for operation by the user, and a pair of wheels 5 for moving the line car 1.

[0020] Hopper 2 is made of, for example, steel plate, stainless steel plate, or synthetic resin material such as polypropylene or polyethylene, and has a generally vertically elongated rectangular box shape. The top opening of hopper 2 is provided with an openable lid 3 to facilitate the addition and refilling of powder, and to prevent the powder from scattering during use and the intrusion of rainwater.

[0021] The handle 4 consists of a pair of vertical members and a horizontal member connecting their upper ends, and the lower ends of each vertical member are fixed to the rear side wall of the hopper 2. The user grasps this handle 4 to operate the line car 1 by pushing or pulling it.

[0022] A pair of wheels 5 are arranged on the sides of the lower part of the hopper 2. Each wheel 5 is fixed to both ends of an axle 10, which will be described later, and rotates integrally with the axle 10. The wheels 5 are made of a material such as rubber or elastomer, and have sufficient gripping power and durability.

[0023] 1(a), a powder discharge outlet 6 having an opening shape corresponding to the line width is provided at the bottom of the hopper 2. A shutter mechanism or lever for opening and closing the powder discharge outlet 6 may also be provided.

[0024] A powder agitating member 50 attached to a crank portion 20 is disposed inside the hopper 2. The crank portion 20 and the powder agitating member 50 will be described in detail later.

[0025] (Details of the powder mixing mechanism) Next, the powder agitation mechanism, which is the core of the present invention, will be described in detail with reference to Figures 2 and 3. Figure 2 is a front view of the powder agitation mechanism disposed inside the hopper 2, and Figure 3 is a side view of the operation of the crank portion.

[0026] (Axles and motion converters) An axle 10 connecting the pair of wheels 5 is disposed so as to penetrate laterally through the lower part of the side wall of the hopper 2. The axle 10 is rotatably supported by a bearing (not shown) provided on the side wall of the hopper 2.

[0027] In this embodiment, the axle 10 is formed by partially bending a shaft member such as a metal rod or cylinder into a U-shape, so that the axle and crank portion 20, which serves as a motion converter, are integrally formed. When attaching this integrally formed axle 10 to the hopper 2, first, one of the wheels 5 is removed, and the axle 10 is inserted through one of the bearing holes provided in the side wall of the hopper 2. Next, inside the hopper 2, the powder agitating member 50 is assembled to the bent crank portion 20. Thereafter, the tip of the axle 10 is protruded to the outside through the other bearing hole, and the wheel 5, which was previously removed, is fixed in place.

[0028] This integrally formed axle 10 has two crank portions 20. Each crank portion 20 is located eccentrically from the main shaft portion of the axle 10 and determines the amplitude (stroke) of the up and down movement of the powder agitating member 50. This integrated structure reduces the number of parts, lowers manufacturing costs, and simplifies assembly.

[0029] The axle 10 of this embodiment may be additionally provided with a rotary stirring mechanism 7, as used in the prior art, between the two crank portions 20. This rotary stirring mechanism 7 is, for example, a brush-like member that rotates integrally with the axle 10 to assist the powder stirring performed by the up-and-down reciprocating motion of the powder stirring member 50, which is the main component of the present invention. However, this rotary stirring mechanism 7 is not an essential component of the present invention.

[0030] (powder stirring member) The powder agitating member 50 is disposed inside the hopper 2 and above the powder discharge port 6, and has an overall gate-like or torii-like shape.

[0031] The powder agitating member 50 is composed of a beam portion 51 disposed in the horizontal direction and a pair of legs 52 extending downward from both ends of the beam portion 51 and connected to the crank portion 20 .

[0032] The lower end of each leg 52 is formed in a ring shape and slidably fits onto the outer periphery of the corresponding crank section 20. This ring-shaped portion is formed, for example, by fastening two separate members, either vertically or horizontally, with fastening members such as bolts, to enable assembly to the integrally formed crank section 20. Furthermore, to reduce sliding resistance and improve durability, it is preferable to interpose a bushing (a part that fills the gap between parts) made of a self-lubricating resin (for example, fluororesin or polyacetal) on the contact surfaces of the fitting portions, or to provide a thick-film lubricating layer to hold lubricant.

[0033] This not only maintains smooth operation for a long period of time, but also eliminates the need for periodic lubrication, improving maintainability, and eliminates the risk of lubricating oil being mixed into the powder, thereby increasing safety, particularly when applied to spraying devices for agricultural materials, etc.

[0034] In this embodiment, as shown in FIG. 2, the beam portion 51 has a corrugated shape (uneven portions) for efficiently capturing and loosening the powder. This shape increases the contact area with the powder, making it easier for the powder to be caught, thereby enabling effective mixing. The shape of the beam portion 51 is not limited to a corrugated shape (uneven portions), and may be a comb-like, sawtooth, or loop-like shape. Furthermore, as shown in the side view of FIG. 1(b), the beam portion 51 preferably has a shape that is gently curved toward the front of the line car. This forward curvature extends the mixing effect in the front-to-rear direction of the hopper when the powder mixing member 50 moves up and down, allowing the powder remaining on the bottom surface of the hopper to be mixed evenly over a wider area. The beam portion 51 is the main part that comes into contact with the powder during the up and down movement and exerts the mixing effect.

[0035] Lightweight and corrosion-resistant aluminum alloys, stainless steel, or engineering plastics such as polyacetal (POM) and polyamide (nylon) are preferably used as materials for the powder agitating member 50. In addition, by applying a fluororesin coating to the surface of the powder agitating member 50, it is possible to prevent a decrease in the agitation effect due to the adhesion of powder.

[0036] (Action of the stirring mechanism) Next, the operation of the present embodiment configured as described above will be described with reference to Figures 3 and 4. When a user holds the handlebars 4 and drives the line car 1 forward or backward, the wheels 5 roll on the ground, and the axles 10 rotate together with the wheels 5.

[0037] When the axle 10 rotates, the integrally formed crank portion 20 also rotates so as to revolve around the axis of the axle 10. Figure 3(a) shows the crank portion 20 when it reaches the top dead center of rotation, and Figure 3(b) shows it when it reaches the bottom dead center. This rotational motion causes the powder agitating member 50 to perform a reciprocating motion (up and down movement) in the up and down direction via its leg portions 52 by the amplitude shown in the figure.

[0038] Figure 4 shows a schematic diagram of how this up-and-down movement destroys a bridge. In Figure 4(a), a large mass of powder P forms bridge 1 above the powder outlet 6. Furthermore, above bridge 1, another mass of powder, bridge 2, is formed with a gap in between.

[0039] 4(a) shows the powder agitating member 50 at its lowest position, that is, when the crank portion 20 reaches the bottom dead center of rotation. In this state, the powder flow is hindered by the bridge.

[0040] Next, when the axle 10 rotates and the crank portion 20 reaches the top dead center of rotation, the powder agitating member 50 is raised to its highest position, as shown in Figure 4(b). At this time, the beam portion 51 acts to push up the underside of the bridge, causing cracks or even destruction in the bridge.

[0041] Then, as shown in Figure 4(c), the destroyed bridges collapse, the powder regains its fluidity, and is discharged uniformly from the powder discharge port 6. This series of actions is continuously repeated as the line car moves, thereby preventing the formation of bridges, or immediately destroying any bridges that may form.

[0042] Thus, the agitation mechanism of the present invention, which mainly uses up-and-down reciprocating motion, has an essential feature in that it exerts a more powerful and direct physical action of "breaking down and loosening" the powder, whereas conventional rotary agitation mechanisms simply perform a rotational motion that "stirs" the powder. This fundamental difference in the mode of motion makes it possible to achieve an extremely high agitation effect even with powders with high moisture contents, which have been difficult to handle with conventional agitation mechanisms.

[0043] Furthermore, by curving the powder agitating member 50 forward, the agitating effect is also exerted in the front-to-back direction of the hopper 2, allowing the powder inside the hopper 2 to be evenly loosened. This effectively breaks down strong bridges, which were difficult to achieve with conventional rotary agitating members, and allows the powder to be constantly kept fluid. Furthermore, to effectively prevent powder from accumulating, particularly in the lower center of the hopper, and forming cavities around the powder agitating member 50, the shape of the beam 51 can be further devised. For example, the wave-shaped valleys of the beam 51 can be configured to protrude deeper downward, to a position close to the axle 10 or the optional rotary agitating mechanism 7, or an auxiliary agitating member (not shown) can be provided below the beam 51, connecting the middle portions of the pair of legs 52, separate from the beam 51. With these configurations, when the powder stirring member 50 reaches the bottom dead center of its reciprocating motion, the deeply formed valleys and auxiliary stirring members reach near the bottom of the hopper, directly breaking down the powder in the center, which tends to stagnate, making it possible to extremely effectively suppress the occurrence of cavities.

[0044] (Other embodiments) While the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments. Various changes, modifications, substitutions, etc., as described below, can be made without departing from the spirit of the present invention.

[0045] (Variation 1) In the above embodiment, the powder agitation mechanism is described as having an axle and a crank portion integrally formed, but these may also be formed as separate members. FIG. 5 is a diagram showing the main parts of a powder agitation mechanism according to another embodiment. In FIG. 5, the crank portion 20, which serves as the motion conversion portion of the powder agitation mechanism, can be formed from a pair of crank webs 30 and a crank pin 35 connecting them, which are generally known as components of a crankshaft in an internal combustion engine or the like. In this case, the crank portion 20, consisting of the crank webs 30 and the crank pin 35, is fixed to the linear axle 10 using a key, set screw, or the like.

[0046] This configuration offers advantages, particularly in terms of assembly and maintenance. Compared to the process of inserting an integrally formed crankshaft into the hopper and aligning it with the bearing holes on both sides, the linear axle 10 can be inserted into the hopper first, and then the crank web 30 and crank pin 35 can be installed using the space inside the hopper. This significantly improves workability during manufacturing and repair. This assembly method also makes it possible to form the ring-shaped portions at the lower ends of the legs 52 of the powder agitating member 50 into an inseparable, one-piece structure. Furthermore, because each part can be manufactured individually, it is possible to select the optimal material for each role, such as a material with high torsional rigidity for the axle and a material with excellent wear resistance for the crank pin, thereby improving the durability of the entire product.

[0047] (Variation 2) As a simpler configuration different from the first variation of the above embodiment, the crank portion 20 may be a cylindrical rotating body, known as an eccentric collar, that is eccentric by a predetermined amount relative to the axis of the axle 10. More specifically, the eccentric collar is a disk-shaped or cylindrical member whose center of its outer diameter (outer center) is offset by a predetermined eccentricity from the center of its inner diameter (axial hole center) through which the axle 10 passes. When the axle 10 rotates around its axis, the outer surface of the eccentric collar revolves around the axis of the axle 10 with this eccentricity as its radius. The legs 52 of the powder agitating member 50 slidably fit onto this outer surface, converting the rotational motion of the axle into stable up-and-down reciprocating motion of the legs 52. In this case, the crank portion can be constructed simply by fixing the eccentric collar to the linear axle 10 using a set screw, key, or the like. This configuration has the advantages of requiring very few parts, significantly reducing manufacturing costs, and being extremely easy to assemble.

[0048] (Variation 3) The number of crank parts 20 is not limited to two, and may be one or three or more. For example, it is possible to provide one crank part at the center of the axle and combine it with a powder agitating member having one corresponding leg part.

[0049] (Variation 4) A variable stroke mechanism that can adjust the eccentricity of the crank portion may be provided. For example, a mechanism that allows the position of the crank pin 35 to be moved radially on the crank web 30 and fixed with a set bolt or a mechanism that selectively attaches multiple sleeves (eccentric sleeves) with different eccentricities to the axle is possible. This allows the amplitude of the up-and-down movement of the powder agitator to be changed stepwise or continuously depending on the type and condition of the powder (for example, a small stroke for powder with a coarse particle size that does not easily solidify, and a large stroke for powder that contains moisture and is prone to solidification) to achieve the optimal mixing effect.

[0050] (Variation 5) A clutch mechanism may be interposed between the axle and the crank section, which stops the operation of the stirring mechanism when stirring is not required (for example, when moving a line car when empty), thereby reducing unnecessary wear and noise.

[0051] (Variation 6) In the above embodiment, the crank unit 20 is used as the motion conversion unit, but the present invention is not limited to this. For example, a cam with a non-circular outer periphery may be attached to the axle 10, and the underside of the leg 52 of the powder agitating member 50 may be elastically abutted against the outer periphery of the cam. In this case, the cam rotates as the axle 10 rotates, and the leg 52 is pushed up in accordance with the outer periphery shape and then lowered by its own weight or a biasing member, causing the powder agitating member 50 to move up and down.

[0052] The biasing member used here, and the biasing member optionally provided in the main embodiment to maintain the axial position of the crank portion, are not limited to coil springs, but may also be a leaf spring, a rubber elastic ring, etc. Also, by designing the cam profile (peripheral shape), it is possible to realize more complex and diverse reciprocating motions, such as asymmetrical motions (e.g., slowly lifting and quickly dropping) to achieve specific stirring effects, or motions that temporarily stop.

[0053] (Variation 7) In the above embodiment, the powder agitating member 50 is configured to mainly perform up-and-down reciprocating motion. However, a back-and-forth swinging motion may also be added. FIG. 6 is a side view illustrating a back-and-forth swinging mechanism. For example, as shown in FIG. 6, a first fulcrum 61 is provided at an arbitrary position on the leg 52 of the powder agitating member 50, and a second fulcrum 62 is provided at an arbitrary position on the inner wall of the hopper 2. These two fulcrums are then connected by a link arm 60. With this configuration, the link arm 60 moves in an arc around the fulcrum 62 as the crank unit 20 moves up and down, causing the entire powder agitating member 50 to swing back and forth. This allows the powder at the entire bottom of the hopper to be agitated in a more three-dimensional and wide-area manner, further improving agitation efficiency.

[0054] (Variation 8) In the above embodiment, the powder agitating member 50 is formed from a plate-shaped member, but it may also be formed by bending a single continuous wire or round bar. In this case, in addition to the beam portion 51 and the leg portion 52, an auxiliary agitating portion connecting the middle portion of the leg portion 52 can be formed integrally. The auxiliary agitating portion may have any shape, for example, a loop shape or a comb shape. This auxiliary agitating portion also agitates the powder by moving up and down or swinging back and forth. This configuration has the advantage of eliminating the need for welding and assembly processes, greatly simplifying the manufacturing process.

[0055] (Variation 9) In the above embodiment, the beams 51 of the powder agitator 50 are wavy. However, to further enhance the agitation effect, a configuration such as that shown in FIG. 7 may also be used. The powder agitator 50 according to this modification further includes a comb portion 53 consisting of multiple protrusions extending downward integrally from the beams 51. As shown in FIG. 7, the comb portion 53 preferably has a mountain-shaped profile in which the longest protrusions are located in the center and gradually become shorter toward both ends. Furthermore, horizontal flat portions 54 are provided at the lower ends of each protrusion to connect them. With this configuration, the longest central protrusions exert a concentrated crushing action on the lower center of the hopper, where powder bridging and cavities are most likely to occur during reciprocating motion. At the same time, the flat portions 54 scrape away powder near the bottom of the hopper, urging the powder toward the powder discharge outlet 6. In this way, the combination of the targeted, powerful breaking-down action of the comb portion 53 and the scraping action of the flat plate portion 54 allows the powder in the hopper to be stirred over a wider area and in a three-dimensional manner, allowing for more stable discharge.

[0056] (Variation 10) FIG. 8 shows a bicycle-type line marking device 100 according to another embodiment of the present invention. This bicycle-type line marking device 100 is composed of a line car 1 equipped with a reciprocating stirring mechanism according to the present invention, a bicycle body 120, and a connecting member 130 connecting the two. The connecting member 130 is the hatched portion in FIG. 8 and is a member for connecting the line car 1 to the front of the body 120. In this way, the line car of the present invention can be used not only as a stand-alone push-type device, but also as a component of a bicycle-type line marking device. [Industrial Applicability]

[0057] The line car of the present invention can be used in various sports facilities such as school grounds, athletics stadiums, baseball fields, and soccer fields, and can also be used effectively for drawing dividing lines and temporary lines in parking lots, roads, construction sites, etc.

[0058] In particular, because discharge problems caused by powder solidification or clogging can be significantly reduced, high reliability and work efficiency can be achieved even when working in humid environments or using powder that has been stored for a long period of time and tends to solidify. Therefore, the present invention has wide industrial applicability in industries such as sports equipment manufacturing and civil engineering and construction. Furthermore, the reciprocating powder agitation mechanism of the present invention can be suitably installed not only in hand-pushed line cars, but also in the powder discharge section of bicycle-type line marking devices such as those shown in Patent Documents 2 to 5. This enables more stable powder supply even when the bicycle-type line marking device is traveling at high speeds, further improving its performance and reliability. [Explanation of symbols]

[0059] 1 Line Car 2 Hopper 3 Lid 4 Handle 5 wheels 6 Powder outlet 7 Rotary stirring mechanism 10 axles 20 Crank section 30 Crank Web 35 crank pin 50 Powder stirring member 51 Beam section 52 Legs 53 Comb part 54 Flat plate part 60 link arm 61 First Fulcrum 62 Second Fulcrum 100 Bicycle-type line drawing device 120 Vehicle body 130 Connecting member 200 Conventional rotary stirring mechanism 300 conventional axle P powder

Claims

1. a hopper for storing powder; a rotatable wheel and an axle that support the hopper and rotate together with the wheel; a powder discharge port provided on the bottom surface of the hopper; In a line car equipped with a motion conversion unit provided on the axle for converting rotational motion of the axle into reciprocating motion in an up-and-down direction; a powder agitating member connected to the motion converting unit and configured to agitate the powder in the hopper by reciprocating motion in the up and down direction; Further provided with the motion converting unit includes at least two crank units, each of which is a rotating body having a center eccentric to the axis of the axle, spaced apart in the axial direction of the axle; The powder agitating member has at least two connecting portions, each of which is slidably fitted onto the outer periphery of the corresponding crank portion, and which moves back and forth in the vertical direction as the crank portion rotates.

2. A line car as described in claim 1, wherein the powder agitating member has a beam portion arranged horizontally, and the powder agitating member has a shape curved toward the front of the line car.

3. 3. The line car according to claim 1 or 2, The line car is characterized in that the powder agitating member has a beam portion arranged horizontally, and the beam portion has an uneven shape for agitating the powder.

4. In the line car according to claim 1, The powder agitating member may further include a link arm that connects one point of the powder agitating member to one point of the inner wall of the hopper, A line car characterized in that the powder agitating member swings back and forth in association with the reciprocating motion.

5. A line car according to claim 1; The vehicle body, a connecting member that connects the line car and the vehicle body; A bicycle-type line drawing device comprising:

Images